The products are faced on both sides with reinforced aluminium foil to give Class O rating and excellent smoke resistance.

The slabs are designed to be cut on site to produce cavity fire stops of 900mm length and in widths to suit individual floor void depths between 50 and 600mm.
 
Rockwool AF 30 and AF 60 Access Floor FireStops have been tested and assessed in accordance with BS 476: Part 20 1987 and have achieved 30 minutes and 60 minutes fire insulation and integrity respectively. LPC Test Report TE 91727 and Assessment number CC91988 refers.
 
Acoustic When used below access floors Rockwool Access Floor FireStops will reduce appreciably the levels of airborne sound transmission through the floor cavity.